Design Guidelines: Plastic Injection Moulding

Our basic guidelines for plastic injection moulding include important design considerations to help improve part mouldability, enhance cosmetic appearance, and reduce overall production time.

We offer a number of secondary moulds and tooling services to support your project. Our design cube shows part features that are too thin or too thick, bad bosses, right and wrong ribs, and other considerations to be mindful of while designing parts for injection moulding.


 Size

SIZE

480mm x 770mm

VOLUME

966,837 mm³ 

DEPTH

101mm from parting line with 3° of draft

Up to 202mm if the parting line can pass through the middle of the part
Projected Mould Area

112,903 mm²

 

Typically, Proto Labs can maintain a machining tolerance of +/- 0.08mm with an included resin tolerance that can be greater than but no less than +/- 0.005mm/mm

an applications engineer examines a prototype part

Design Feedback
For additional questions, please contact a Customer Service Engineer at customerservice@protolabs.co.uk  or +44 (0) 1952 683 047


Materials

  • ABS
  • ABS/PC
  • Acetal
  • Acetal Copolymer
  • Acetal Homopolymer
  • ETPU
  • HDPE
  • LCP
  • LDPE
  • LLDPE
  • Nylon 6
  • Nylon 5/12
  • PBT
  • PC/PBT
  • PEEK
  • PEI
  • PET
  • PETG
  • PMMA
  • Polycarbonate
  • Polypropylene
  • PPA
  • PPE/PS
  • PS

VIEW MATERIALS >

colour resins for plastic injection moulding prototyping


Surface Finishes

FINISH DESCRIPTION
PM-F0 non-cosmetic, default

PM-F1

low-cosmetic, most toolmarks removed
SPI-C1 600 grit stone, 10-12 Ra
PM-T1 SPI-C1 + light bead blast
PM-T2 SPI-C1 + medium bead blast
SPI-B1 600 grit paper, 2-3 Ra
SPI-A2 grade #2 diamond buff, 1-2 Ra

 

adding surface finish to a mold


Draft

VERTICAL FACES
0.5°
MOST SITUATIONS
MINIMUM FOR SHUT OFF
MINIMUM FOR LIGHT TEXTURE (PM-T1)
MINIMUM FOR LIGHT TEXTURE (PM-T2) 5°+


Undercuts

Maximum Side Core Dimensions

WIDTH HEIGHT

PULL

< 213.84mm <60.38mm <73.66mm


Wall Thickness

MATERIAL

RECOMMENDED WALL THICKNESS

ABS

1.143mm - 3.556mm

Acetal

0.762mm - 3.048mm

Acrylic 0.635mm - 12.7mm
Liquid Crystal Polymer 0.762mm - 3.048mm
Long-Fiber Reinforced Plastics 1.905m - 25.4mm
Nylon 0.762mm - 2.921mm
Polycarbonate 1.016mm - 3.81mm
Polyester 0.635mm - 3.175mm
Polyethylene 0.762mm - 5.08mm
Polyphenylene Sulfide 0.508mm - 4.572mm
Polypropylene 0.635mm - 3.81mm
Polystynene 0.889mm - 3.81mm
Polyurethane 2.032mm - 19.05mm

 * The table is adapted from manufacturingcenter.com.


Radii

Some part corners will have a radius rather than a sharp edge since we use an automated CNC milling process to make the mould for your parts. This typically does not require a change to your model, but resulting radii are identified before the mould is milled.


press operator examines part

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